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X-CSE-ConnectionGUID: 2hJkV6P6Rxy6mLke//OzRw== X-CSE-MsgGUID: iwppBcb7TU+8j1M2rR0DHg== X-IronPort-AV: E=McAfee;i="6800,10657,11586"; a="63411697" X-IronPort-AV: E=Sophos;i="6.19,249,1754982000"; d="scan'208";a="63411697" Received: from orviesa007.jf.intel.com ([10.64.159.147]) by orvoesa110.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 23 Oct 2025 01:45:40 -0700 X-CSE-ConnectionGUID: Ucc0EPCqSiCBkTSZJ6NNCw== X-CSE-MsgGUID: M6DulzDDRF26JDQ0xCqgcQ== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.19,249,1754982000"; d="scan'208";a="183995303" Received: from bkammerd-mobl.amr.corp.intel.com (HELO kuha.fi.intel.com) ([10.124.221.165]) by orviesa007.jf.intel.com with SMTP; 23 Oct 2025 01:45:30 -0700 Received: by kuha.fi.intel.com (sSMTP sendmail emulation); Thu, 23 Oct 2025 11:45:29 +0300 Date: Thu, 23 Oct 2025 11:45:28 +0300 From: Heikki Krogerus To: Chaoyi Chen Cc: Greg Kroah-Hartman , Dmitry Baryshkov , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Vinod Koul , Kishon Vijay Abraham I , Heiko Stuebner , Sandy Huang , Andy Yan , Yubing Zhang , Frank Wang , Andrzej Hajda , Neil Armstrong , Robert Foss , Laurent Pinchart , Jonas Karlman , Jernej Skrabec , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Amit Sunil Dhamne , Chaoyi Chen , Dragan Simic , Johan Jonker , Diederik de Haas , Peter Robinson , linux-usb@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-phy@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-rockchip@lists.infradead.org, dri-devel@lists.freedesktop.org Subject: Re: [PATCH v7 2/9] drm/bridge: Implement generic USB Type-C DP HPD bridge Message-ID: References: <20251023033009.90-1-kernel@airkyi.com> <20251023033009.90-3-kernel@airkyi.com> Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20251023033009.90-3-kernel@airkyi.com> On Thu, Oct 23, 2025 at 11:30:02AM +0800, Chaoyi Chen wrote: > From: Chaoyi Chen > > Several USB-C controller drivers have already implemented the DP HPD > bridge function provided by aux-hpd-bridge.c, but there are still > some USB-C controller driver that have not yet implemented it. > > This patch implements a generic DP HPD bridge based on aux-hpd-bridge.c, > so that other USB-C controller drivers don't need to implement it again. > > Signed-off-by: Chaoyi Chen > --- > drivers/gpu/drm/bridge/Kconfig | 11 ++++ > drivers/gpu/drm/bridge/Makefile | 1 + > .../gpu/drm/bridge/aux-hpd-typec-dp-bridge.c | 51 +++++++++++++++++++ > 3 files changed, 63 insertions(+) > create mode 100644 drivers/gpu/drm/bridge/aux-hpd-typec-dp-bridge.c > > diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig > index b9e0ca85226a..9f31540d3ad8 100644 > --- a/drivers/gpu/drm/bridge/Kconfig > +++ b/drivers/gpu/drm/bridge/Kconfig > @@ -33,6 +33,17 @@ config DRM_AUX_HPD_BRIDGE > menu "Display Interface Bridges" > depends on DRM && DRM_BRIDGE > > +config DRM_AUX_TYPEC_DP_HPD_BRIDGE > + tristate "TypeC DP HPD bridge" > + depends on DRM_BRIDGE && OF && TYPEC > + select DRM_AUX_HPD_BRIDGE > + help > + Simple USB Type-C DP bridge that terminates the bridge chain and > + provides HPD support. > + > + If the USB-C controller driver has not implemented this and you need > + the DP HPD support, say "Y" or "m" here. You don't need to depend on DRM_BRIDGE separately, but do you really need a separate module for this in the first place? > config DRM_CHIPONE_ICN6211 > tristate "Chipone ICN6211 MIPI-DSI/RGB Converter bridge" > depends on OF > diff --git a/drivers/gpu/drm/bridge/Makefile b/drivers/gpu/drm/bridge/Makefile > index 245e8a27e3fc..e91736829167 100644 > --- a/drivers/gpu/drm/bridge/Makefile > +++ b/drivers/gpu/drm/bridge/Makefile > @@ -1,6 +1,7 @@ > # SPDX-License-Identifier: GPL-2.0 > obj-$(CONFIG_DRM_AUX_BRIDGE) += aux-bridge.o > obj-$(CONFIG_DRM_AUX_HPD_BRIDGE) += aux-hpd-bridge.o > +obj-$(CONFIG_DRM_AUX_TYPEC_DP_HPD_BRIDGE) += aux-hpd-typec-dp-bridge.o Instead, why not just make that a part of aux-hpd-bridge conditionally: ifneq ($(CONFIG_TYPEC),) aux-hpd-bridge-y += aux-hpd-typec-dp-bridge.o endif thanks, -- heikki